/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/Collision/CollisionConstraintAllocator.h
Set the constraint as Active - it will be added to the graph and solved this tick. NOTE: This actually just enqueues the constraint - actual activation happens after the parallel phase is done.
[bool](API\Runtime\Chaos\Chaos\Collision\Chaos__Private__bool\1) ActivateConstraint ( [FPBDCollisionConstraint](API\Runtime\Chaos\Chaos\Collision\FPBDCollisionConstraint) * Constraint )